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Analysis of ocular surface area for comfortable VDT workstation layout

Article Abstract:

Distance between keyboard and the cathode ray tube (CRT) influences the ocular surface area (OSA). No significant difference exists in average OSA in different visual display terminal (VDT) workstations. OSA increases when looking at the CRT and decreases when viewing the keyboard, with an increase in distance between CRT and the keyboard. Data suggests that the desk height should correspond to user's height and CRT should be placed closer to the keyboard as it reduces the OSA in VDT workstation users. The vertical orientation of gaze provides visual ease.

Adjustments of posture and viewing parameters of the eye to changes in the screen height of the visual display terminal

Article Abstract:

Body position changes at the workstation complement the eye position for better viewing of the visual target. The adjustments of eye position and body posture to various screen height settings are used to determine the motions caused by interactions among various body parts. The viewing angle in individuals using a computer game requiring constant visual monitoring is decided by inclination of the neck and the eye. Thoracic bending has a small effect on the visual angle. A significant correlation is obtained between viewing distance and trunk inclination.

Does fatigue exist in a quantitative measurement of eye movements?

Article Abstract:

Long-term ocular experiments do not result in a statistically measureable level of eye fatigue. A study of the saccadic eye movements of six young male subjects tested with rapid eye tracking tasks over a period of five hours shows that there is no quantitative level of fatigue in the subjects. Infra-red ray optical reflections from the corneal surfaces were used as the eye movement measurement technique for the purposes of the study.